import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../../core/l10n/app_localizations.dart';
import '../../../core/theme/app_colors.dart';
import '../../../providers/auth_provider.dart';

// ── 输入方式 Tab（邮箱 / 手机号）────────────────────────────

class AuthInputMethodTab extends StatelessWidget {
  const AuthInputMethodTab({
    super.key,
    required this.selected,
    required this.onSelect,
  });
  final AuthInputMethod selected;
  final ValueChanged<AuthInputMethod> onSelect;

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        AuthTabItem(
          label: AppLocalizations.of(context)!.emailTab,
          active: selected == AuthInputMethod.email,
          onTap: () => onSelect(AuthInputMethod.email),
        ),
        const SizedBox(width: 24),
        AuthTabItem(
          label: AppLocalizations.of(context)!.phoneTab,
          active: selected == AuthInputMethod.phone,
          onTap: () => onSelect(AuthInputMethod.phone),
        ),
      ],
    );
  }
}

// ── 登录模式 Tab（密码 / 验证码）────────────────────────────

class LoginModeTab extends StatelessWidget {
  const LoginModeTab({
    super.key,
    required this.selected,
    required this.onSelect,
  });
  final LoginMode selected;
  final ValueChanged<LoginMode> onSelect;

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        AuthTabItem(
          label: AppLocalizations.of(context)!.passwordLoginTab,
          active: selected == LoginMode.password,
          onTap: () => onSelect(LoginMode.password),
        ),
        const SizedBox(width: 24),
        AuthTabItem(
          label: AppLocalizations.of(context)!.codeLoginTab,
          active: selected == LoginMode.code,
          onTap: () => onSelect(LoginMode.code),
        ),
      ],
    );
  }
}

// ── 单个 Tab 项 ───────────────────────────────────────────────

class AuthTabItem extends StatelessWidget {
  const AuthTabItem({
    super.key,
    required this.label,
    required this.active,
    required this.onTap,
  });
  final String label;
  final bool active;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    return GestureDetector(
      onTap: onTap,
      child: Column(
        children: [
          Text(
            label,
            style: TextStyle(
              color: active ? cs.onSurface : cs.onSurface.withAlpha(153),
              fontSize: 15,
              fontWeight: active ? FontWeight.w600 : FontWeight.w400,
            ),
          ),
          const SizedBox(height: 4),
          if (active)
            Container(
              height: 2,
              width: 24,
              decoration: BoxDecoration(
                color: AppColors.brand,
                borderRadius: BorderRadius.circular(1),
              ),
            ),
        ],
      ),
    );
  }
}

// ── 通用输入框 ────────────────────────────────────────────────

class AuthField extends StatelessWidget {
  const AuthField({
    super.key,
    required this.controller,
    required this.hint,
    this.obscure = false,
    this.suffixIcon,
    this.keyboardType,
    this.onChanged,
    this.maxLength,
    this.semanticsLabel,
    this.focusNode,
    this.errorText,
    this.inputFormatters,
  });

  final TextEditingController controller;
  final String hint;
  final bool obscure;
  final Widget? suffixIcon;
  final TextInputType? keyboardType;
  final ValueChanged<String>? onChanged;
  final int? maxLength;
  final String? semanticsLabel;
  final FocusNode? focusNode;
  final String? errorText;
  final List<TextInputFormatter>? inputFormatters;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final hasError = errorText != null && errorText!.isNotEmpty;
    final errorBorder = OutlineInputBorder(
      borderRadius: BorderRadius.circular(10),
      borderSide: BorderSide(color: cs.error, width: 1.5),
    );
    return Semantics(
      label: semanticsLabel,
      textField: true,
      child: TextField(
        controller: controller,
        focusNode: focusNode,
        obscureText: obscure,
        keyboardType: keyboardType,
        onChanged: onChanged,
        maxLength: maxLength,
        inputFormatters: inputFormatters,
        buildCounter: maxLength != null
            ? (_, {required currentLength, required isFocused, required maxLength}) => null
            : null,
        style: TextStyle(color: cs.onSurface, fontSize: 15),
        decoration: InputDecoration(
          hintText: hint,
          hintStyle: TextStyle(color: cs.onSurface.withAlpha(80), fontSize: 15),
          contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 16),
          suffixIcon: suffixIcon,
          errorText: errorText,
          errorStyle: TextStyle(color: cs.error, fontSize: 12),
          // 聚焦态：品牌黄描边，覆盖全局主题的主文字色
          focusedBorder: hasError
              ? errorBorder
              : OutlineInputBorder(
                  borderRadius: BorderRadius.circular(10),
                  borderSide: const BorderSide(color: AppColors.brand, width: 1.5),
                ),
          enabledBorder: hasError ? errorBorder : null,
        ),
      ),
    );
  }
}

// ── 发送验证码按钮 ────────────────────────────────────────────

class SendCodeButton extends StatelessWidget {
  const SendCodeButton({
    super.key,
    required this.countdown,
    required this.onTap,
  });
  final int countdown;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        height: 50,
        padding: const EdgeInsets.symmetric(horizontal: 14),
        decoration: BoxDecoration(
          color: onTap != null ? AppColors.brand : AppColors.brand.withAlpha(60),
          borderRadius: BorderRadius.circular(10),
        ),
        child: Center(
          child: Text(
            countdown > 0 ? '${countdown}s' : AppLocalizations.of(context)!.sendCode,
            style: TextStyle(
              color: onTap != null ? Colors.black : Colors.black.withAlpha(100),
              fontSize: 13,
              fontWeight: FontWeight.w600,
            ),
          ),
        ),
      ),
    );
  }
}